• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    METHOD AND APPARATUS FOR DETECTION OF RIPPLE AND PHASE LOSS Methods and apparatus are presented for the detection of phase loss and/or excessive ripple in a power converter, in which bandpass filters are used to obtain harmonic voltage amplitudes. associated with the power converter DC bus, and a phase loss is detected if a ratio of the second harmonic to the sixth harmonic and/or a ratio of the fourth harmonic to the sixth harmonic exceeds predetermined threshold values.
    公开号:BR102014004934B1
    申请号:R102014004934-7
    申请日:2014-02-28
    公开日:2022-01-25
    发明作者:Bing Li；David Leggate；Timothy Rowan
    申请人:Rockwell Automation Technologies, Inc；
    IPC主号:
    专利说明:

    BACKGROUND
    [001] Power conversion systems are used for generating and providing AC output power to a load, such as a single-phase or multi-phase AC motor driven by an inverter stage of a motor-drive power converter. The power converter typically receives AC input power from a three-phase supply, and an input rectifier provides a DC bus voltage from which the inverter generates AC output signals to drive the load. In voltage source converters, the DC bus or a DC link includes one or more capacitors, which are often electrolytic capacitors. However, an excessive ripple voltage on the DC bus increases the ripple current flowing in the bus capacitor(s), which can strain the electrolytic capacitors, potentially leading to overheating and shortening the operating life of the capacitor. An early detection of excessive DC bus ripple voltage can be used to provide an alarm or a safe stop of the power converter, before damage or voltage to the bus capacitor. However, many ripple detection approaches involve additional circuitry or are computationally intensive, adding cost and complexity to the system. Another problem in power conversion systems is the loss of an AC input phase, which can increase the DC bus ripple voltage and reduce the DC voltage supplied to the inverter. Therefore, an input phase loss detection can also be used to trigger an alarm or a power converter fault for continued safe or stopped operation. Conventional phase loss detection techniques, however, are generally cumbersome or expensive or unable to adequately detect all phase loss conditions. For example, simple detection techniques have been proposed, in which the difference between the DC bus voltage and the DC bus voltage squared is compared to a threshold, and if the threshold is exceeded, excessive DC bus ripple is assumed. is present or a phase loss has occurred. Other techniques involve detecting an instantaneous DC bus voltage and comparing this to upper and lower limit boundaries, as well as calculating an average value of the ripple period over the same cycle, but these techniques are prone to noise and suffer from noise. low accuracy and slow response speed. Therefore, improved techniques and apparatus are desirable for cost-effective and robust detection of excessive ripple and phase loss in a power conversion system. SUMMARY
    [002] Various aspects of the present exhibition are now summarized, to facilitate a basic understanding of the exhibition, where this summary is not an extensive overview of the exhibition, and is not intended to identify certain elements of the exhibition, nor to delineate the scope of the exhibition. Rather, the primary purpose of this summary is to present various concepts of exposition in a simplified form, prior to the more detailed description that is presented here below.
    [003] The present exposition provides fast, accurate and robust techniques and apparatus for detecting DC bus ripple and an input phase loss according to one or more predetermined harmonics of the bus voltage with respect to the fundamental frequency of power of AC input. These concepts can be employed for detecting an input phase loss with respect to multiphase input systems, as well as for detecting excessive ripple content in both single and multiphase systems. In certain embodiments, as described here, bandpass filters can be used as harmonic detectors for monitoring and detecting the amplitude of the sixth harmonic content in the DC bus voltage along with either or both of the second and fourth harmonics, with phase loss and/or excessive ripple conditions being detected based on one or more of these harmonics. The exposed techniques can facilitate improved accuracy in detecting phase loss and/or excessive ripple and are robust and less prone to noise than previous approaches. Also, the exposed detection apparatus provides a quick and timely calculation of harmonic content and detection of adverse ripple and/or phase loss conditions, and can be implemented in hardware and/or firmware running on a processor or software running on a processor. in a power converter controller with little or no added cost or complexity. Consequently, the exposed techniques provide a significant advance over conventional approaches and find particular utility in association with low cost motor drives and other power conversion systems in which ripple and phase loss detection is desired.
    [004] In accordance with one or more aspects of the present disclosure, a power conversion system is provided which includes a detection system with a filter that provides an output signal or value representing an amplitude of a predetermined harmonic of a fundamental frequency of the AC input power at the DC bus voltage. The system further includes a logic circuit which detects excessive ripple on the DC bus and/or a phase loss associated with the AC input power at least partially in accordance with the filter output signal or value. In certain embodiments, the filter includes two or more bandpass filters individually providing an output signal or value representing the amplitude of a corresponding predetermined harmonic, and the logic detects a ripple based on at least one of the filter output signals or values, and selectively detects a phase loss based on the output of at least two of the bandpass filters.
    [005] In certain embodiments, first and second bandpass filters provide output signals or values representing the amplitudes of the second and sixth harmonics, respectively, with the logic selectively detecting excessive ripple at least partially in accordance with the amplitude of the sixth harmonic. , and selectively detecting a phase loss according to the second and sixth harmonic amplitudes. In many implementations, a phase loss detection is based on a ratio of the second harmonic to the sixth harmonic, with the logic providing a detection signal if the ratio exceeds a predetermined threshold. In certain embodiments, furthermore, another bandpass filter is used to obtain the fourth harmonic, and a ratio of the fourth and sixth harmonics can also be compared to a threshold for a selective identification of phase loss in the power converter. Also, or separately, the sixth harmonic can be compared with another threshold to selectively identify excessive DC bus voltage ripple conditions. Various implementations, moreover, may advantageously employ second-order generalized integrator (SOGI) type bandpass filters, where the filter and logic in certain embodiments may be implemented using one or more programmable processors. Thus, cost-effective implementations are contemplated, in which a power conversion system controller performs digital filtering computations for implementing bandpass filters based on sampled DC bus voltage signals or values, and further implements boundary comparisons, whereby substantially no additional circuitry is required to implement the ripple and phase loss features of this exhibit.
    [006] Programmed computer readable methods and means are provided in accordance with additional aspects of exposure for detecting phase loss and/or excessive ripple conditions in a power conversion system. The method includes sampling the DC bus voltage, and obtaining a sixth harmonic and at least one of second and fourth harmonics at the sampled voltage, as well as detecting input phase loss, if a ratio of one of a second harmonic and the fourth harmonic to the sixth harmonic exceeds a predetermined threshold. BRIEF DESCRIPTION OF THE DRAWINGS
    [007] The following description and drawings set out certain illustrative implementations of the exposition in detail, which are indicative of various exemplary forms in which the various principles of exposition can be realized. The illustrated examples, however, are not exhaustive of the many possible modes of exposition. Other objectives, advantages and new features of the exhibition will be set out in the following detailed description, when considered in conjunction with the drawings, in which:
    [008] Figure 1 is a simplified schematic diagram illustrating a motor drive power conversion system implementing a ripple and phase loss detection system using bandpass filters, for the identification of predetermined voltage harmonics across the DC bus in accordance with one or more aspects of the present disclosure;
    [009] Fig. 2 is a schematic diagram illustrating an exemplary second-order generalized integrator type bandpass filter in the detection system of Fig. 1;
    [010] Figure 3 is a schematic diagram illustrating a detection system modality using two bandpass filters for the identification of second and sixth harmonics in the DC bus voltage for the detection of excessive ripple and/or phase loss in the system of figure 1;
    [011] Figure 4 is a schematic diagram illustrating another type of detection system using three bandpass filters to obtain second, fourth and sixth harmonics of the DC bus voltage for detecting excessive ripple and/or loss of phase;
    [012] Figure 5 is a flowchart illustrating an example method or process for detecting excessive ripple in a power conversion system; and
    [013] Figure 6 is a flowchart illustrating an example method or process for detecting phase loss in a power conversion system. DETAILED DESCRIPTION
    [014] With reference now to the figures, various embodiments or implementations are described hereinafter in conjunction with the drawings, wherein like reference numbers are used to refer to like elements throughout, and where the various features do not are necessarily drawn to scale.
    [015] The methods and devices are exposed for the detection of ripple and phase loss of power converter, in which one or more rejection filters (bandpass) can be used to check harmonic content in the DC bus voltage of a power converter for the identification of phase loss and/or excessive ripple voltage, whereby adverse effects on bus capacitors and other system components can be mitigated or avoided by selective triggering of system alarms and/or faults . The various concepts of the present exposition are presented in the context of a motor drive type 100 power conversion system, although the exposed apparatus and techniques can be employed in any type of power conversion system using a DC bus. Furthermore, the detection apparatus and methods may be implemented using hardware circuitry and/or may advantageously be embodied in programmable instructions stored in a power converter controller for execution by one or more processors in the conversion system. For example, many motor drive systems include a circuit for sensing and sampling the DC bus voltage, e.g. for closed-loop control purposes, as well as programmable processing elements (e.g., microprocessors, microcontrollers, FPGAs). , etc.) implementing various computational tasks associated with inverter switching, communications, I/O functions and the like. The concepts of phase loss and excessive ripple presently exposed can be implemented in these existing processor(s) to use sample values of DC bus voltage already available in the system, whereby no additional hardware may be required. In addition, the exposed techniques provide fast, high-accuracy, robust detection methods, which are less prone to noise and simple to implement compared to conventional approaches. In certain implementations, for example, multiple harmonics can be detected by digital filtering techniques, with simplified tuning requiring only one parameter (for example, a frequency, such as 50 Hz or 60 Hz), where as little as Second-order generalized integrator (SOGI) rejection can be used to detect cured phase loss in a timely manner, whereby processing time is minimal.
    [016] The inventors have appreciated that an operation of a motor drive or other power converter by a balanced three-phase power supply results in the main harmonic component following a rectification on the DC bus to be the sixth order harmonic, with respect to to the frequency of the AC input power. For example, using a three-phase input power of 60 Hz, the ripple voltage on the DC bus following a full bridge passive rectifier stage will be at 360 Hz (300 Hz harmonic for a 50 Hz input power) . Further, the inventors appreciated that if an input phase has been lost, the dominant harmonics will have become the second and fourth harmonics (e.g. 120 Hz and 240 Hz, respectively, for an input frequency of 60 Hz). The present exposition thus contemplates the monitoring of the second, fourth and sixth harmonics (and, optionally, only the sixth harmonic and one of the second and fourth harmonics) of the DC bus voltage for the identification of phase loss and input phase loss. .
    [017] Referring initially to Figure 1, a motor-drive type control system 100 is illustrated, including a six-device passive rectifier stage 110 receiving a three-phase input power from a source 10 through wires 11 , 12 and 13, wherein the rectifier 110 converts the AC input power to the supply of DC power to a DC bus 120. As shown in Figure 1, the DC bus circuit 120 includes a C bus capacitance which can be a single capacitor or multiple capacitors connected in any suitable configuration, in series, in parallel or a combination of series/parallel. The operation of the rectifier 110 causes a DC bus voltage Vdc to be provided across the C bus capacitance, and this voltage is converted by an inverter 130 to generate one or more AC output signals for driving a load 20, such as a motor in the illustrated example, through output wires 21, 22, and 23. Although illustrated as driving a three-phase motor load 20, any suitable inverter 130 may be used having single-phase or multi-phase outputs. As illustrated, the example inverter 130 includes switching devices of the title may IGBT Q1, Q2, Q3, Q4, Q5 and Q6 operable according to inverter switching control signals 144 from an inverter control component 142 of a drive controller 140. In addition, the drive controller 140 receives one or more signals or values 122 representing the DC Vdc bus voltage, for example, through one or more sensors, as are known (not shown).
    [018] In accordance with the various aspects of the present disclosure, the drive controller 140 includes a ripple and phase loss detection system 150, which includes one or more bandpass filters (BPFs) 152 providing filter output signals. or values for a logic circuit 154 representing the amplitude of a corresponding predetermined harmonic of a fundamental frequency of the AC input power at the DC bus voltage Vdc. Logic 154, in turn, selectively detects one or both of an excessive ripple on the 120 DC bus and/or a phase loss associated with the AC input power, based at least partially on the output signal(s) of filter or value(s). In one possible implementation, the bandpass filter or filters 152 may be individually operative hardware filters for receiving an analog input signal 122 representing the DC bus voltage Vdc, and for providing a filter output signal indicative of the amplitude. of a predetermined harmonic of the fundamental frequency. In such embodiments, for example, logic circuit 154 may be dedicated hardware logic operative for evaluating phase loss and/or excessive ripple, based on the filter output signal(s) from the filter(s) 152.
    [019] In alternative implementations, the logic 154 can be implemented through a programmable processor element, such as a microprocessor, a microcontroller, etc., based on an analog to digital conversion of analog filter output signals from of the bandpass filter(s) 152. In still other possible embodiments, the ripple and integer phase loss detection system 150 may be implemented using at least one digital processor programmed using computer executable instructions suitable for implementing bandpass filters 152 by digital filtering techniques, as are known, based on sampled DC bus voltage values (converted from analog to digital) and for providing filter output values representing the amplitude of the corresponding harmonic content of the sampled DC bus voltage values, as well as for implementing logic 154 to selectively prove rem an output signal or excessive ripple value 156 and/or an output signal or phase loss detection value 158, based on the filtered outputs.
    [020] As seen in Figure 1, further, output signals or detector values 156 and 158 can be provided to inverter controller 142 for use in this way, such as to safely stop inverter operation, upon detection of one or both of these conditions, and the detection outputs 156, 158 may also be used by other supervisory control components of the power conversion system 100 and/or may be communicated to external devices for appropriate action. Further, logic 154 and/or drive controller 140 can generally be configured or programmed to take user configurable action based on detection of excessive ripple voltage 156 or phase loss 158. In this regard, system 100 can be configured to selectively initiate an alarm based on one or both of conditions 156, 158 and/or to initiate a fault condition, e.g. to initiate one or more safety stop operations, instigate remedial actions, send warning messages, etc.
    [021] Referring also to Figure 2, a second order generalized integrated bandpass filter (SOGI) of example 152 is illustrated, including an input for receiving the signal or voltage value of the DC Vdc bus, as well as as the V, Vamp and QV outputs. Although a second-order bandpass filter 152 is illustrated, any suitable second-order or higher bandpass or reject filter can be used, which provides a lower cutoff at the input frequency and a higher cutoff at the input frequency. output for implementing bandpass filtering, as is known. As previously mentioned, bandpass filter 152 can be implemented through programming instructions by a system processor, and the components indicated in Figure 2 can each be implemented in processor-executed software or processor-executed firmware. in certain implementations. Among the functional components in the bandpass filter 152 of Figure 2 are summation functions 160, 168, and 182, a gain function 164, multiplier functions 170 and 174, as well as integrator functions 172 and 176 (shown as 1/1 blocks). S in the figure). In addition, block 180 in Fig. 2 provides a square root sum of squares operation with respect to the quadrature output values V and QV, for generating the Vamp amplitude output.
    [022] As seen in Figure 2, the DC bus voltage input Vdc is received by the initial summation junction 160 of the filter 152, and the output voltage V is subtracted therefrom to generate an error signal or value 162. Error 162 is multiplied by a gain value K through a gain function 164 to provide an adjusted error value 166. A return value from a multiplier 174 is subtracted from the adjusted error value 166 through a adder 168, the output of which is provided to a multiplier 170 for multiplication by a harmonic frequency value w' = nw, where w is the back surface frequency and n is the harmonic order of interest. For example, the power supply fundamental frequency may be 60 Hz in one example, and a particular bandpass filter 152 may be tuned with respect to a predetermined harmonic thereof, e.g., the second harmonic (e.g., 120 Hz, n = 2), the fourth harmonic (eg, 240 Hz, n = 4), or the sixth harmonic (eg, 360 Hz, n = 6) in various example modes. The output of multiplier 170 is integrated by a 1/S function 172 for providing the output V. This output V is also provided as an input to a second integrator function 176, whose output is multiplied by w' using another multiplier function 174. The output of the second multiplier 174 is subtracted from the adjusted error signal or value 166 through the adder 168, as described above, and the adjusted error is subtracted from the output of the multiplier 174 through another summation function 182, in order to provide the quadrature output Qv. Furthermore, the square root sum of squares function 180 provides the amplitude output as the square root of the sum of squares of the square values V and QV.
    [023] The bandpass filter 152 in this mode thus provides three outputs including the quadrature signals V and QV, and the Vamp output representing the nth order harmonic amplitude in relation to the input frequency value W. As seen, the filter of example SOGI 152 is relatively simple to implement in hardware or using digital filtering techniques on a programmed processor, and only includes two integrators 172 and 176 together with a parameter K. The output signals V and QV are defined by the functions transfer rates shown in equations (1) and (2) below:

    [024] V and QV both have a gain of zero at the frequency of o' , but have a phase delay of 0 and 90 degrees, respectively. Also, the example filter removes the DC component of Vdc, due to the large negative gain of V and QV at a low frequency. Furthermore, due to the fact that V and QV are quadrature signals at frequency o', the amplitude of harmonics at that frequency o' can be easily computed through the amplitude function 180 according to equation (3) below:

    [025] Referring now to Figures 3 and 4, two example modalities of a ripple/phase loss detection system 150 are illustrated, in which multiple harmonics can be detected by using multiple filters 152, as exemplified in Figure 2. The example in Figure 3 uses flow channels 152a and 152b for the identification of second and sixth order harmonics, respectively, in the DC Vdc bus voltage for detecting excessive ripple and/or phase loss in the power system. power conversion 100. Figure 4 shows another embodiment using three bandpass filters 152a, 152b and 152c to obtain second, fourth and sixth harmonics of Vdc for detecting excessive ripple and/or phase loss. In these embodiments, the amplitude outputs from the bandpass filters 152 are V2_amp, V4_amp, and V6_amp, which represent or otherwise indicate the detected second-, fourth-, and sixth-order harmonic amplitudes at which the harmonic detector fourth-order is optional, as seen in figure 3.
    [026] As mentioned above, each of the filters 152 receives an input frequency w', which is a multiple of the fundamental power supply frequency w, and also includes an input terminal (indicated as IN in Figures 3 and 4). ), where the illustrated examples optionally employ summing blocks to selectively remove the other computed harmonics from the sample DC Vdc bus voltage input. Thus, for example, the system 150 of Figure 3 includes an adder 190 that provides an input to a first bandpass filter 152a by subtracting the sixth order harmonic output v6 from the other filter 152b of the bus voltage signal or Vdc value. . Likewise, a summation function 194 is used for the subtraction of the second order filter output v2 of the bandpass filter 152a from the bus voltage Vdc for the provision of the input to the sixth order harmonic bandpass filter 152b . The input of each harmonic detector or bandpass filter 152 is therefore substantially Vdc after removing other in-line harmonic signals which are extracted from other harmonic detectors 152, although the summation functions 190 and 194 may be omitted in certain modalities. In addition, the detection system 150 in Figure 3 includes integer multipliers 192 (n = 2) and 196 (n = 6) that operate respectively to regulate the frequency inputs o' for the second and sixth order bandpass filters. 152a and 152b for the respective second and sixth order harmonics of the fundamental frequency o.
    [027] In the example of figure 3, the logic circuit 150 implements a comparator 200 that compares the amplitude of the sixth order harmonic v6_amp with a threshold value 202 (THR), and generates an active high boolean output signal to indicate a voltage of excessive ripple on the DC bus 120 if the amplitude v6_amp of the sixth order harmonic exceeds the threshold 202. In practice, the threshold value 202 can be set to any suitable value by which a normal sixth order ripple content on the DC bus 120 can be distinguished from excessive or abnormal amounts of curl. In this regard, the inventors appreciated that the use of three-phase passive full-bridge rectifiers 110, as is common in low-cost power conversion systems 100, will lead to normal or nominal sixth-order harmonic content of the DC bus voltage. Vdc, and that a threshold value 202 can be set higher than this normal operating level, while being low enough to detect increases in ripple, before adverse effects on the C-bus capacitor (Figure 1).
    [028] In addition, the logic circuit 154 of figure 3 includes a divider circuit 210 providing an output 214 that represents the value of the ratio of the second order harmonic amplitude to the sixth order harmonic amplitude (v2_amp / v6_amp). Ratio value 214 is compared to a first phase loss threshold value 212 (THPL1), and a comparator 220 generates an active high phase loss output signal or value 158 when the ratio of the second and sixth harmonics order 214 exceeds the threshold value 212. The inventors have appreciated that the occurrence of an input phase loss condition will result in an increase in the second and/or fourth order harmonic content of the DC Vdc bus voltage, and may also result in in a decrease in the amplitude of the sixth-order DC-bus voltage harmonic content. Therefore, the illustrated embodiment advantageously computes or otherwise generates a signal or ratio value 214, which will increase upon the occurrence of a loss-of-phase condition. In practice, the first phase loss threshold value 212 may be set so that the ratio value 214 is nominally below threshold 212 during normal operation, and threshold value 212 is preferably set low enough that the ratio value 214 exceeds threshold value 212 upon the occurrence of a phase loss at the AC input.
    [029] Figure 4 illustrates another embodiment employing three bandpass filters 152a (which generates an output signal indicating the amplitude of the second-order harmonic), 152b (for the sixth harmonic), and the third bandpass filter 152c providing an output amplitude (v4_amp) representing the amplitude of the fourth order harmonic of the DC bus voltage Vdc. In the illustrated embodiment, a pair of summing junctions is provided between the IN inputs of the respective bandpass filters 152 and the sampled DC voltage value Vdc so as to subtract the other two in-line harmonics being computed. For example, the IN input to the second-order bandpass filter 152a is provided from adders 190 and 230, which successively subtract the sixth-order and fourth-order harmonic outputs v6 and v4 from the other bandpass filters. 152b and 152c, respectively. Similarly, the IN input to the second bandpass filter 152b for generating the sixth order harmonic output value is provided to the adders 194 and 232 for subtracting the second and fourth order harmonics, and the input to the A third bandpass filter 152c is provided through adders 234 and 236 which respectively subtract the second and sixth order harmonic values v2 and v6. In addition, the third bandpass filter 152c is set to provide a signal or amplitude value of the fourth order harmonic v4_amp by using a multiplier 238 (n = 4) for the provision of w' introduced at the fourth harmonic of the fundamental frequency. w (for example, at 240 Hz for a fundamental frequency of 60 Hz).
    [030] In this example, like that of figure 3 above, the logic circuit 154 includes a comparator 200, which compares the sixth order harmonic amplitude value v6_amp with the threshold value THR 202, and selectively actuates the detection output of ripple 156, if the sixth harmonic v6_amp exceeds threshold 202. In this case, however, the phase loss detection output 158 is selectively activated, by one or both conditions via an OR gate 260. In particular, the signal phase loss output 158 is generated if the ratio 214 of the second and sixth order harmonic amplitudes exceeds the first predetermined threshold value 212 (THPL1) or if a ratio 244 of the fourth and sixth order harmonic values exceeds one second predetermined threshold value 242 (THPL2). In this implementation, therefore, logic circuit 154 implements a second divider function 240 computing or otherwise generating the ratio 244 of the fourth and sixth order harmonic amplitude signals or values, as well as a comparator 250 providing an active high output signal. to output OR gate 260, if the ratio of the fourth and sixth harmonics exceeds a THPL2 threshold of 242.
    [031] Referring also to figures 5 and 6, methods 300 and 350 are provided for detecting excessive DC bus voltage ripple and/or loss of AC input phase in accordance with additional aspects of the exhibit. Although the example methods are shown and described in the form of a series of acts or events, it will be appreciated that the various methods of exposition are not limited by the illustrated ordering of these acts or events, except as specifically set forth herein. Accordingly, except as specifically provided herein below, some acts or events may occur in a different order and/or concurrently with other acts or events apart from those illustrated and described herein, and not all illustrated steps may be required for the implementation of a process or method in accordance with the present disclosure. The illustrated methods may be implemented in hardware, software running on a processor, or combinations thereof, in order to provide ripple detection and/or phase loss detection and power conversion circuits, and may be implemented in a power converter and/or in a separate device. For example, these techniques can be employed in power converters 100 including motor drives, such as those illustrated and described herein, although the present disclosure is not limited to the applications and systems specifically illustrated and described.
    [032] Figure 5 illustrates a method 300 for detecting excessive ripple in a DC bus voltage of a power conversion system (eg motor drive 100 above). Method 300 starts at 302, where a DC voltage (eg, Vdc) is sampled, and a sixth-order harmonic of the sample voltage is obtained at 304. At 306, a determination is made as to whether the sixth-order harmonic is of the DC bus voltage is greater than a ripple threshold value (eg THR 202 above). If not (NOT at 306), the DC bus voltage will again be sampled at 302, and the process will continue as described above. If the sixth order harmonic exceeds the threshold (YES at 306), excessive ripple will be detected at 308 (e.g. ripple detection output 156 in figures 3 and 4 above is actuated), and one or more alarms being faults can be started at 310.
    [033] Figure 6 illustrates a method 350 for selectively detecting an AC input phase loss in a power conversion system, in which a DC bus voltage from the power converter is sampled 352. At 354, the sixth harmonic order of sample DC bus voltage is obtained, and a second (and optionally fourth) order harmonic is obtained at 356. At 358, one or more relationships are obtained indicating the relationship of the second order harmonic to the second order harmonic. sixth order and optionally the ratio of the fourth order harmonic to the sixth order harmonic, and a determination is made at 360 as to whether one or both of the ratios exceeds a threshold (e.g. THPL1 or THPL2 above). If not (NOT at 360), the process repeats at 352-360. If either ratio exceeds the threshold (YES at 360), a phase loss occurrence will be detected at 362 (e.g. phase loss detection output 158 above), and one or more alarms or faults will be initiated at 362. 364.
    [034] In accordance with further aspects of the present disclosure, a non-transient computer readable medium is provided, such as a computer memory, a memory in a power converter control system (e.g., a controller 100 , a CD-ROM, a floppy disk, a flash drive, a database, a server, a computer, etc.), which includes computer executable instructions for performing the methods described above. The above examples are merely illustrative of various possible embodiments of various aspects of the present disclosure, in which equivalent changes and/or modifications will occur to others skilled in the art upon reading and understanding this specification and the accompanying drawings. In particular, with respect to the various functions performed by the components described above (assemblies, devices, systems, circuits and the like), the terms (including a reference to a “means”) used for the description of these components are intended to correspond, as unless otherwise indicated, to any component, such as hardware, software running on a processor, or combinations thereof, which performs the specified function of the described component (i.e., is functionally equivalent), although not structurally equivalent to the exposed structure, which performs the function in the illustrated installations of the exhibition. Furthermore, while a particular feature of the exhibit may have been exposed with respect to only one of several implementations, that feature may be combined with one or more other features of the other implementations as may be desired and advantageous for any given application or in private. Also, to the extent that the terms "including", "includes", "having", "has", "with" or variants thereof are used in the detailed description and/or claims, these terms are intended to be inclusive in a similar way to the term “comprising”.
    权利要求:
    Claims (4)
    [0001]
    1. Power conversion system (100), comprising: a rectifier (110) operative to convert AC input power from a three-phase power source (10) to provide DC power to a DC bus (120); an inverter (130) operative to generate at least one AC output signal for driving a load (20) using power from the DC bus (120), characterized in that a detection system (150) comprising: a filter (152) operative to provide a filter output signal or value representing an amplitude of a predetermined harmonic of a fundamental frequency of the AC input power at a voltage (Vdc) of the DC bus (120), and a logic circuit (154) operative to detect at least one of an excessive ripple on the DC bus (120) and a phase loss associated with AC input power based at least partially on the filter output signal or value, wherein the filter (152) comprises : a first bandpass filter (152a) operative to provide a first filter or value output signal (v2_amp) representing an amplitude of a second harmonic of the fundamental frequency of the AC input power at the bus voltage (Vdc) DC (120), and a second bandpass filter (152b) operative to provide a second filter or value output signal (v6_amp) representing an amplitude of a sixth harmonic of the fundamental frequency of the AC input power at voltage (Vdc) the DC bus (120); and the logic circuit (154) is operative to: detect excessive ripple on the DC bus (120) if the second filter output signal or value (v6_amp) exceeds a predetermined ripple threshold (THR), and detect an associated phase loss to AC input power, if a ratio of the first filter output signal or value (v2_amp) to the second filter output signal or value (v6_amp) exceeds a first predetermined threshold (THPL1).
    [0002]
    2. Power conversion system (100), according to claim 1, characterized in that the bandpass filters (152) are second-order generalized integrators.
    [0003]
    3. Power conversion system (100), according to claim 1, characterized in that: the filter (152) comprises a third bandpass filter (152c) operative to provide a third filter output signal or value (v4_amp) representing a fourth harmonic amplitude of the fundamental frequency of the AC input power at the voltage (Vdc) of the DC bus (120); and wherein the logic circuit (154) is operative to detect a phase loss associated with the AC input power, if a ratio of the third filter output signal or value (v4_amp) to the second filter output signal or value ( v6_amp) exceeds a second predetermined threshold (THPL2).
    [0004]
    4. Method (300, 350) for detecting excessive ripple on a DC bus in a power conversion system (100) and for detecting phase loss associated with a three-phase AC input power to the power conversion system. power (100), the method characterized in that it comprises: converting, by a rectifier (100), the AC input power from a three-phase power source (10) to supply DC power to a DC bus (120 ); generating at least one AC output signal for driving the load (20) using DC bus power (120); sampling (302, 352) a voltage (Vdc) from the DC bus (120) of the power conversion system (100); obtaining (304, 354) an amplitude of a sixth harmonic of a fundamental frequency of the AC input power at the sampled voltage (Vdc) of the DC bus (120); detecting (308) excessive ripple on the DC bus if the sixth harmonic amplitude exceeds a predetermined ripple threshold value (THR); obtaining (356) at least a second harmonic amplitude and a fourth harmonic amplitude of the fundamental frequency of the AC input power at the sampled voltage (Vdc) of the DC bus (120); obtaining (358) a ratio of one of the amplitude of the second harmonic and the amplitude of the fourth harmonic to the amplitude of the sixth harmonic; and detecting (360, 362) a phase loss associated with the AC input power if the ratio exceeds a first predetermined threshold (THPL).
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    同族专利:
    公开号 | 公开日
    EP2775597A3|2015-07-29|
    CN104038074A|2014-09-10|
    CN104038074B|2017-03-01|
    EP2775597A2|2014-09-10|
    US9036382B2|2015-05-19|
    EP2775597B1|2021-01-06|
    US20140254217A1|2014-09-11|
    BR102014004934A2|2015-06-16|
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    法律状态:
    2015-06-16| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-11-13| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-02-04| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-09-21| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-12-28| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-01-25| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/02/2014, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/787,291|2013-03-06|
    US13/787,291|US9036382B2|2013-03-06|2013-03-06|Method and apparatus for ripple and phase loss detection|
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